IAMWstDecoder::SetDrawBackgroundMode method (iwstdec.h)
[The feature associated with this page, DirectShow, is a legacy feature. It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation. Those features have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer, IMFMediaEngine and Audio/Video Capture in Media Foundation instead of DirectShow, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]
Downstream filters use the SetDrawBackgroundMode method to assign whether the caption text background is to be opaque or transparent.
Syntax
HRESULT SetDrawBackgroundMode(
[in] AM_WST_DRAWBGMODE Mode
);
Parameters
[in] Mode
A member of the AM_WST_DRAWBGMODE enumeration that specifies whether the caption text background is to be opaque or transparent.
| Value | Description |
|---|---|
| AM_WST_DRAWBGMODE_Opaque | Caption text background is opaque. |
| AM_WST_DRAWBGMODE_Transparent | Caption text background is transparent. |
Return value
When the method succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code.
Requirements
| Minimum supported client | Windows XP [desktop apps only] |
| Minimum supported server | Windows Server 2003 [desktop apps only] |
| Target Platform | Windows |
| Header | iwstdec.h |
| Library | Strmiids.lib |